Left AC Joint Hypertrophy (Post-Traumatic Arthritis) Resulting in Subacromial Impingement

Series of illustrations comparing the normal AC joint (with thick|shock absorbing articular cartilage covering smooth articular bone) to the joint during a traumatic event and after resulting post-traumatic changes. The post-traumatic hypertrophy then results in irritation and compression of the underlying rotator cuff structures.